What is class polychetae - marine worms, Biology

Assignment Help:

What is Class Polychetae - Marine Worms?

The polychaetes differ from the oligochaetes in several ways. The name itself suggests one of the differences. The prefix "poly" means "many," as opposed to "oligo," meaning "few." Thus, the polychaetes have many hair-like bristles. They also have paired appendages called parapodia that bear the numerous setae. Parapodia have several functions, including helping the worms swim or crawl, as well as providing an anchoring mechanism. Parapodia, in addition, provide increased surface area for gas exchange. Most polychaetes live in marine habitats, and they can be found either living as plankton, crawling on the sea floor, or living in tubes, which the worms secrete around themselves.

Polychaetes also differ from the other two groups in that their anterior is better developed. They have a definite head region with sensory apparatus that include light-sensitive eyes.

 

 


Related Discussions:- What is class polychetae - marine worms

What are the functions of polypeptide chains, Q. Since among the 64 codons ...

Q. Since among the 64 codons of mRNA 61 codify amino acids that form polypeptide chains what are the functions of the three remaining codons? Since there are 20 amino acids and

Genetics , write about complementary genes

write about complementary genes

Explain about the forces acting on a gravity retaining wall, Explain about ...

Explain about the forces acting on a gravity retaining wall. Forces Acting on a Gravity Retaining Wall: In a general way the forces that act on a gravity retaining wall. The

Difference between unconditioned & conditioned reflex action, Difference be...

Difference between unconditioned and conditioned reflex action- S.NO .   1. UNCONDITIONED   It is inborn CONDITIONED

Umbilical and inguinal hernia, Umbilical Hernia: An umbilical hernia  ...

Umbilical Hernia: An umbilical hernia  is protrusion of a portion of intestine  through  the umbilical ring (an opening in the muscular area of the abdomen where the umbilical

Embden meyerhof pathway, Anaerobic Oxidation Embden Meyerhof pathway ...

Anaerobic Oxidation Embden Meyerhof pathway The initial  stage of biological oxidiation  includes  a series of nine  main sequential   steps  of reactions  known  as Embd

Which functional groups ionization stabilized by resonance, In which of the...

In which of the following functional groups ionization is stabilized by resonance? Select one: a. Carboxyl b. Hydroxyl c. Amine d. Aldehyde e. All of the above

Phytochrome - floral induction, Phytochrome - Floral Induction Phytoch...

Phytochrome - Floral Induction Phytochrome a pigment that exists in two different inter convertible forms was discovered by Hendricks and Borthwrick et. al. and was chemically

Define sample titration for estimation of reducing sugar, Define Sample Tit...

Define Sample Titration for Fehling Soxhlet Method Dilute the given sample glucose solution in 100 ml volumetric flask to the mark with distilled water. Pipette 5 ml of Fehling

Cytokinesis, Cytokinesis It is defined  as the division or cleavage  of...

Cytokinesis It is defined  as the division or cleavage  of cytoplasmic  part   of the cells  into  two  daughter  cells. It is first  indicated   during  late  anaphase  by app

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd